Liner for tube-mills.



F. E. JOHNSON.

LINER 'FOR TUBE MILLS.

APPLICATION FILED MAYZG, l9l6.

1,%3,7 2D Patented Oct. 23,1917:

WI T/VE SSE 8: /IV [/5 IV TOR fl Y Fran/ il. JUuwan. W 5 i I By M MW Arromvsy/ FRAN K E. JOHNSON, OF SALT LAKE CITY, UTAH, ASSIGNOB TO AMERICAN MANGANESE STEEL COMPANY, OF AUGUSTA, MAINE, A CORPORATION OF MAINE.

LINER FOR TUBE-MILLS.

specification of Letters Patent. Patented 0017. 23, 191' Application filed May 26, 1916. Serial No. 99,943.

To all whom it may concern:

Be it known that I, FRANK E. JOHNSON, a citizen of the United States, and a resident of Salt Lake City, in the county of Salt Lake and State of Utah, have made and invented certain new and useful Improvements for Liners for Tube-Mills, of which the following is a specification. I I

My invention relates to tumbling mills and particularly to pebble and ball mills for grinding and pulverizing.

One of the objects of my invention is'to provide a simple and inexpensive liner that can easily and quickly be applied to a tumbling mill without having to depend upon cement or other material of like nature for securing the liner inplace.

My invention consists of a series of slabs of metal, or other suitable material, held in place by wedge-shaped bars bearing against the edges of adjacent plates, the bars being bolted to the shell of the mill.

My invention will be more clearly understood by referring to the drawings, wherem:-

Figure 1 showsa longitudinal section through a tumbling mill embodying my invention;

Fig. 2 is a transverse section showing the liners and the means for retaining them in place.

The tube mill consists of a shell 10 of any suitable material. In the form shown this mill is adapted to rotate on its long axis and is provided at the ends with openings 11, 12

for the insertion and withdrawal of material.

to be treated. Suitable covers for these openings may be provided.- As the most wear comes in the part of greatest diameter, 1 find it preferable to apply the liners embodymg my invention in this part of the tumbling mill. The liners in the other portion of the mill may be secured to the shell by cementing, or other means, as it is seldom necessary to remove these. The numeral 13 indicates a liner which is of varying thickness, it being thickest at its middle point.

The outer surface is curved to conform to the curvature of the shell of the mill and the inner'surface is fiat. The edges 14 lie in planes which converge toward the axis of the mill. For holding the slabs 13 in place I provide wedge-shaped bars 15 havingsurfer to core out the portions-between adjacent bolts, as shown at 18, Fig. 1, thus forming bosses 19 through which the heads of the bolts 20 pass. In the tapering sections 21, 22

of the mill I prefer to taper off the bars 15 so that the outer ends thereof will be flush with the top portions of the plates 13 as shown at 23. This is done to prevent any accumulation of matter in the conical ends of the mill.

It will be found by this invention that the lining of a mill can-be put in quickly and se- J curely, and that renewals can be easlly made,

and that the bars besides holding the slabs securely in position, have the further advantage of preventing undue wear caused by sliding motion of thepebbles or balls on the lining of the mill, and that by the use of these bars the pebbles 01' balls are lifted higher at each revolution of the mill, thus increasing the inding or pulverizing efficiency of the m ll and that by' reason of the thickness of the slabs being proportioned as described the loss of metal in worn out liners is reduced.

This method of lining a mill improves the work done by the mill by preventing the slip of the pebbles or balls in the mill. Economy is also obtained by this method in the wear of liners. The slabs and other parts are only shown fitted within parts of the inside of the mill but in use they will be preferably fitted all around the inside and be varied according to circumstances.

It will be obvious to those skilled in the art that several modifications may be made, and such modifications as are within the scope of the claim, I consider as coming within the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States is I A liner for a tube mill having a central cylindrical portion I and Y conical ends, consisting of a plurality of lining plates having beveled edges, removable wedge-shape holding bars interposed between the lining plates and locln'ng the same in place, the

holding bars in the cylindrical portion of the mill extending beyond the -outer work- I g neee ea ing surface of the lining plates, the holding bars located in the conical portion of the mill diminishing in height above the outer Signed at Salt Lake Gity, in the county of Salt Lake and State of Utah, this 10 day 0 of May, A. 11)., 1916.

FRANK E. JOHNSON.

Witnesses: ELLEN JOHNSON, (I F. DAVIS. 

